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By knowing how much mortgage you can handle, you can ensure that homeownership will fit in your budget.

Homeownership should make you feel safe and secure, and that includes financially. Be sure you can afford your home by calculating how much of a mortgage you can safely fit into your budget.

Why not just take out the biggest mortgage a lender says you can have? Because your lender bases that number on a formula that doesn’t consider your current and future financial and personal goals.

Think ahead to major life events and consider how those might influence your budget. Do you want to return to school for an advanced degree? Will a new child add day care to your monthly expenses? Does a relative plan to eventually live with you and contribute to the mortgage?

Consider those lifestyle issues as you check out these four methods for estimating the amount of mortgage you can afford.

1. Prepare a detailed budget.

The oldest rule of thumb says you can typically afford a home priced two to three times your gross income. So, if you earn $100,000, you can typically afford a home between $200,000 and $300,000.

But that’s not the best method because it doesn’t take into account your monthly expenses and debts. Those costs greatly influence how much you can afford. Let’s say you earn $100,000 a year but have $1,000 in monthly payments for student debt, car loans, and credit card minimum payments. You don’t have as much money to pay your mortgage as someone earning the same income with no debts.

See what’s left over to spend on homeownership costs, like your mortgage, property taxes, insurance, maintenance, utilities, and community association fees, if applicable.

2. Factor in your downpayment.

How much money do you have for a downpayment? The higher your downpayment, the lower your monthly payments will be. If you put down at least 20% of the home's cost, you may not have to get private mortgage insurance, which protects the lender if you default and costs hundreds each month. That leaves more money for your mortgage payment.

The lower your downpayment, the higher the loan amount you’ll need to qualify for and the higher your monthly mortgage payment.

But, if interest rates and/or home prices are rising and you wait to buy until you accumulate a bigger downpayment, you may end up paying more for your home.

You might find a lender willing to give you a mortgage with a payment that goes above the 43% line, but consider carefully before you take it. Evidence from studies of mortgage loans suggest that borrowers who go over the limit are more likely to run into trouble making monthly payments, the Consumer Financial Protection Bureau warns.

4. Use your rent as a mortgage guide.

The tax benefits of homeownership generally allow you to afford a mortgage payment -- including taxes and insurance -- of about one-third more than your current rent payment without changing your lifestyle. So you can multiply your current rent by 1.33 to arrive at a rough estimate of a mortgage payment.

Here’s an example: If you currently pay $1,500 per month in rent, you should be able to comfortably afford a $2,000 monthly mortgage payment after factoring in the tax benefits of homeownership.

However, if you’re struggling to keep up with your rent, buy a home that will give you the same payment rather than going up to a higher monthly payment. You’ll have additional costs for homeownership that your landlord now covers, like property taxes and repairs. If there’s no room in your budget for those extras, you could become financially stressed.

Also consider whether or not you’ll itemize your deductions. If you take the standard deduction, you can’t also deduct mortgage interest payments. Talking to a tax adviser, or using a tax software program to do a “what if” tax return, can help you see your tax situation more clearly.

G.M. Filisko is an attorney and award-winning writer who’s owned her own home for more than 20 years. A frequent contributor to many national publications including Bankrate.com, REALTOR® Magazine, and the American Bar Association Journal, she specializes in real estate, business, personal finance, and legal topics.

Visit houselogic.com for more articles like this. Reprinted from HouseLogic with permission of the NATIONAL ASSOCIATION OF REALTORS® Copyright 2016. All rights reserved.